Optical calibration application

Brief Description

Perform optical calibration TOA/TOC (Top Of Atmosphere/Top Of Canopy). Supported sensors: QuickBird, Ikonos, WorldView2, Formosat, Spot5

Tags

Calibration

Long Description

The application allows to convert pixel values from DN (for Digital Numbers) to physically interpretable and comparable values.Calibrated values are called surface reflectivity and its values lie in the range [0, 1]. The first level is called Top Of Atmosphere (TOA) reflectivity. It takes into account the sensor gain, sensor spectral response and the solar illumination. The second level is called Top Of Canopy (TOC) reflectivity. In addition to sensor gain and solar illumination, it takes into account the optical thickness of the atmosphere, the atmospheric pressure, the water vapor amount, the ozone amount, as well as the composition and amount of aerosol gasses. It is also possible to indicate an AERONET file which contains atmospheric parameters (version 1 and version 2 of Aeronet file are supported.

Parameters

• [param] Input Image Filename (-in):

• [param] Output Image Filename (-out): Calibrated Image Filename

• [param] Available RAM (-ram): Available RAM

• [choice] Calibration Level (-level):

  • [group] TOA : Top Of Atmosphere:

  • [group] TOC : Top Of Canopy (EXPERIMENTAL):



• [param] Convert to milli reflectance (-milli): Output milli-reflectance instead of reflectance. This allows to put save the image in integer pixel type (in the range [0, 1000] instead of floating point in the range [0, 1].

• [param] Relative Spectral Response File (-rsr): Sensor relative spectral response file By default the application gets these informations in the metadata

• [group] Atmospheric parameters (-atmo): This group allows to set the atmospheric parameters.

  • [choice] Aerosol Model (-aerosol):

    • [group] No Aerosol Model:

    • [group] Continental:

    • [group] Maritime:

    • [group] Urban:

    • [group] Desertic:

  • [param] Ozone Amount (-oz):

  • [param] Water Vapor Amount (-wa):

  • [param] Atmospheric Pressure (-pressure):

  • [param] Aerosol Optical Thickness (-opt):

  • [param] Aeronet File (-aeronet): Aeronet file containing atmospheric parameters

Limitations

None

Authors

OTB-Team

See also

The OTB CookBook

Example of use

• Parameters to set value:

• Input Image Filename: WV2_MUL_ROI_1000_100.tif

• Output Image Filename: OpticalCalibration.tif

• Calibration Level: toa

• Command line to execute:

otbcli_OpticalCalibration -in WV2_MUL_ROI_1000_100.tif -out OpticalCalibration.tif -level toa